Vaccination involves injecting a small amount of dead or weaken forms of a pathogens into the body (because pathogen is dead and inactive, it cannot lead to the disease of the patient)
1 - The white blood cells are now stimulated to produce antibodies against the dead or inactive pathogen
2- At the same time the white blood cells divide by mitosis to produce lots of copies of itself
3 - If the same pathogen enters the body, even years later, the white blood cells can produce the correct antibodies quickly. This prevents infection
Graph shows the level of antibodies after vaccination and after the body has been invaded by the real pathogen. When the real pathogen invades, the antibody rises very quickly into a very high level and this is due to the vaccination
